griscom



(No Model.) 3 Sheets-Sheet .1.

W. W. GRISO0M.

DYNAMU ELECTRIC MACHINE.

No. 307,388. y Patented Oct. 28, 1884..

WITNESSES [1v [(EJVTOR (NO Model) 3 SheetsSheet 2.

' W. W. GRISGOMr DYNAMO ELECTRIC MACHINE.

Pat qnted Oct. 28,1884.

3 Sheets-Sheet 3.

(No Model.)

W. W. GRISGOM.

DYNAMO ELECTRIC MACHINE.

Patented Oct. 28, 1884.

W, gm

UNITED STATES PATENT OrrIca-Q IVILLIAM \V. GRISCOM, OF PHILADELPHIA, PENNSYLVANIA.

DIYNAMO-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No. 307,388, dated Catcher 2.8, 1884.

Application filed December 21, 1583.

To all whom, it may concern.-

Be it known that I, WILLIAM 1V. GRISCOM, a citizen of the United States, and a resident of Philadelphia, Pennsylvania, have invented certain Improvements in Dynamo-Electric Machines, of which the following is a specification.

My present improvements in dynamoeleetric machines relate more particularly to the construction and method of making the armature and to the construction of the commutatiug devices, as more fully described hereinafter.

In the accompanying drawings, Figure 1 is a longitudinal section of the machine; Fig. 2, an endview; Fig; 3, a side view of the armature, partly in section, and illustrating in diagram the commutating-contacts; and Figs. 4- and 5, aside view and section, respectively, of the armature in process of manufacture.

Referring to Fig. 1, E E are the field-magnets, secured to the two end frames, FF,which may be suitably bolted together in any convenient way, which it has not been deemed necessary to illustrate.

In the drawings I have shown the machine as provided with six coils on each side of the armature-wheel A; but the number may be varied as circumstances may demand. The armature-wheel, whose conductors consist of a series of radial strips of copper constructed as hereinafter set forth, is mounted on an axis, B, adapted to turn in bearings b l) in the end frames, F F, and provided with the usual drivingpulley.

In constructing the armature I proceed in the following manner: A copper casting is made of the form shown in Figs. at and 5, somewhat resembling a wheel,with a number of 1a dial fiat spokes, a, united at their inner ends by a ring, a, and at their outer ends, where they are preferably L-shaped, by a ring, a. The spaces between the spokes, nearboth the hub and the periphery of the wheel, or the en tire spaces, are filled with insulating material, and then the wheel is clamped near its periphery between a pair of rings, 1) D, Fi s, l d 3,with intermediate insulating-washers, d, and

1 the wheel is similarly clamped between rings near its center. The conneetingrings a and a which form temporary connections for the spokes, are then turned off or otherwise rc- (Xo model.)

moved until each spoke a becomes a separate strip electrically insulated from all the others. The inner clamping-rings are then removed and the inner portion of the wheel bolted to the two halt-hubs D D,which are then secured to the central shaft, I3, insulatingwashersbe ing provided between the wheel, hub, and shaft, as shown in Fig. 1. If the entire spaces between the spokes have in the first placebeen 6o filled with insulating material, I prefer to remove so much of it as would lie between the outer clamping-rings and the hub, or, in other words, opposite the lield-n1agnets,when the armature is in place, as indicated in Fig. 3.

In the arrangement of commutating devices illustrated in the drawings the armature itself forms the commutator, one set of commutatorbrushesfli, bei n g in contact with the periphery of the wheel, and the other, K, with the side of the wheel within the ring of field-magnets. There are as many pairs of these inner and outer brushes as there are coils E on eachside of the armature, and the inner set of brushes are connected in pairs, while the outer set are 7 5 also connected in intermediate pairs, as shown in Fig. 3, so as to form with those spokes a of the armature which are in circuit at any particular moment a Zigzag circuit through the armature with terminalsac zv. I prefer to make the brushes K Ii of bundles of copper wires, rods, or strips, with theinterstices filled with amalgam of mercury, and each bundle held in a clamping-ringflr, carried by an arm, L L. The arm L of eachol'the outer set of brushes is pivot- 8 5 ed to a post, f, on one of the end frames F, so as to allow the brushes to be adjusted with reference to the poles of the field.

In order that all the brushes may be adjusted simultaneously and equally, the inner brush- 0 carrying arms, L, are secured to a ring, M, connected by arms to an outer ring, M, mounted on a support, m, secured to the ring of field magnets E, as sho vn in Fig. 1, the rings being adjustable on the piece at or other support. 5 The outer ring carries a series of radialserewrods, a, passing through openings in the arms L and secured thereto by adjustable jam-nuts Z, so that when the rings M M are turned all the brushes will be moved simultaneously. The rings may also be carried by arms 0 o, projecting from a spider, O, mounted on the bearin Z) on one of the end frames, so as to be I 3. A connnutatorbrush consisting of abnnadjustable on that center and adapted to be secured, after adj nstment, by ascre\v,p, passing through a scgmeatal slot, 1), Fig. 2, in the spider.

I claim as my in yenti0n 1. An armature For a'dynamo-electric inachine,havin g its conductors made ofradial'eopper bars with L-shaped outer ends and mounted in the form of a Wheel on a shaft.

2. The method herein described of making an armature, said method consisting in first making a casting of radial bars united by temporary connections, separating the bars byinsulating material, mounting the Whole in clamps, and then removing the said temporary connections, substantially as described.

dle of wires or strips having the interstices filled with an amalgam of copper, substantially as set forth.

4. lhe combination of the frame of a dy namo-electric machine with arms L, pivoted thereto and carrying commntator-brushes, and an adjusting-ring, M, connected to the said arms, substantially as described.

In testimony whereof I have signed my name to this specification in the presence oi'two subscribing Witnesses.

\V. XV. GRI'SCOM.

lVitnesses:

IIARRY SMITH, HUBERT Howso'x. 

